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发明人郑宇鹏,徐明华,郭海燕. "A Process for Preparing High-Purity 4-(Difluoromethyl)-5-hydroxy-2-methylnicotinaldehyde" [P]. 中国发明专利, 专利号 CN 113797544 A, 授权公告日 2017-05-27.
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